//Hiennv
 private void btnListExtraCostRooms_Click(object sender, EventArgs e)
 {
     try
     {
         frmLst_ExtraCostRooms afrmLst_ExtraCostRooms = new frmLst_ExtraCostRooms();
         afrmLst_ExtraCostRooms.Show();
     }
     catch (Exception ex)
     {
         MessageBox.Show("frmLst_Rooms.btnListExtraCostRooms_Click\n" + ex.ToString(), "Lỗi", MessageBoxButtons.OK, MessageBoxIcon.Error);
     }
 }
 public frmUpd_ExtraCostRooms(frmLst_ExtraCostRooms afrmLst_ExtraCostRooms,int ID)
 {
     InitializeComponent();
     this.afrmLst_ExtraCostRooms = afrmLst_ExtraCostRooms;
     this.ID = ID;
 }
 public frmIns_ExtraCostRooms(frmLst_ExtraCostRooms afrmLst_ExtraCostRooms)
 {
     InitializeComponent();
     this.afrmLst_ExtraCostRooms = afrmLst_ExtraCostRooms;
 }